I think I read the original post differently than setherick. I thought by "speed" OP meant the rate at which players improve, not the Max Speed attribute specifically. I'm not sure who's right, but in case I am:
I believe the only factor you can control that affects the rate at which player's improve is playing time. You can't play more games other than if you make the playoffs, but you can make sure the players you want to develop are getting as much playing time in games as possible.
ETA: Currently, coaches do not affect the rate at which players develop, but I believe implementing that is on the roadmap.
Last edited at 7/15/2016 7:09 pm